| 摘要 |
In the process, used sulfuric acid which contains, as minor constituents, methylsulfuric acid, dimethyl ether, methanol, aliphatic and olefinic hydrocarbons, chlorinated hydrocarbons and oligomeric siloxanes, in a first step; (1) used sulfuric acid is diluted by introducing steam and optionally by adding liquid water to a concentration of at most 55% by weight sulfuric acid and is heated to boiling at a maximum of 135 DEG C. and in a second step; (2) the sulfuric acid from the first step is reacted with an oxidizing agent at a temperature of from 20 DEG C. to 130 DEG C.
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